#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
@File          : utils.py
@Description   : 实用函数和数据
@Date          : 2021/10/31 16:18:43
@Author        : ZelKnow
@Github        : https://github.com/ZelKnow
"""
__author__ = "ZelKnow"

BLOCK_BYTE = 16  # 每个Block的字节数
BLOCK_HEX = 2 * BLOCK_BYTE  # 每个Block的十六进制位数

# S盒
S_BOX = [
    0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2,
    0x28, 0xfb, 0x2c, 0x05, 0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3,
    0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99, 0x9c, 0x42, 0x50, 0xf4,
    0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
    0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa,
    0x75, 0x8f, 0x3f, 0xa6, 0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba,
    0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8, 0x68, 0x6b, 0x81, 0xb2,
    0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
    0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b,
    0x01, 0x21, 0x78, 0x87, 0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
    0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e, 0xea, 0xbf, 0x8a, 0xd2,
    0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
    0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30,
    0xf5, 0x8c, 0xb1, 0xe3, 0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60,
    0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f, 0xd5, 0xdb, 0x37, 0x45,
    0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
    0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41,
    0x1f, 0x10, 0x5a, 0xd8, 0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd,
    0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0, 0x89, 0x69, 0x97, 0x4a,
    0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
    0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e,
    0xd7, 0xcb, 0x39, 0x48
]

# 系统参数
FK = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc]

# 固定参数
CK = [
    0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85, 0x8c939aa1,
    0xa8afb6bd, 0xc4cbd2d9, 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
    0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9, 0xc0c7ced5, 0xdce3eaf1,
    0xf8ff060d, 0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
    0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41,
    0x484f565d, 0x646b7279
]


def num2hex(num, width=1):
    """将数字转换为指定长度的十六进制字符串

    Args:
        num (int): 输入数字
        width (int, optional): 指定字符串长度. Defaults to 1.

    Returns:
        str: 输入数字的十六进制字符串表示
    """
    return '{:0>{width}}'.format(hex(num)[2:].replace('L', ''), width=width)


def padding(text):
    """对输入数据进行padding对齐操作

    Args:
        text (str or bytes): 输入数据

    Raises:
        TypeError: 输入数据类型错误

    Returns:
        bytes: padding对齐后的字节表示
    """
    if isinstance(text, str):
        text = text.encode(encoding='UTF8')

    if not isinstance(text, bytes):
        raise TypeError("输入数据类型错误（仅支持str和bytes）")

    p_num = BLOCK_BYTE - (len(text) % BLOCK_BYTE)
    space = b''
    pad_s = (chr(p_num).encode('UTF8') * p_num)
    return space.join([text, pad_s])


def unpadding(text):
    """对输入数据去除padding

    Args:
        text (str or bytes): 输入数据

    Returns:
        str or bytes: 去除padding后的数据
    """
    return text[:-text[-1]]


def bytes_to_list(input_bytes, block_len):
    """将字节串切分成指定长度的子串

    Args:
        input_bytes (bytes): 输入字节串
        block_len (int): 子串长度

    Returns:
        list: 切分后的字节串数组
    """
    block_len = int(block_len)
    return [
        input_bytes[i:i + block_len]
        for i in range(0, len(input_bytes), block_len)
    ]


def list_to_bytes(input_list):
    """将字节串数组拼接成字节串

    Args:
        input_list (list): 字节串列表

    Returns:
        bytes: 拼接后的字节串
    """
    return b''.join(input_list)


def rotl(x, n):
    """循环左移函数

    Args:
        x (int): 输入数据
        n (int): 左移位数

    Returns:
        int: 循环左移n位后的结果
    """
    return ((x << n) & 0xffffffff) | ((x >> (32 - n)) & 0xffffffff)
